Is there sand on the bottom of the sea, and why is there a lot of sand on the seaside?

I don't know what the seabed category you are talking about, but the seabed in the strict sense of the word, there is only sediment, no sand.

Of course there is, but there are none, I'll go to the sea and sprinkle a handful, there will always be.

This is because the rocks on the seashore fall into the sea due to weathering and erosion, and the continuous erosion of the seawater, coupled with the friction between the rocks, makes the rocks become sand, the sand is relatively light, and the water can easily wash away the sand, and finally put them on the shore.

In addition, there is the blowing effect of the wind: when the wind blows from the land to the ocean, it will carry some sand, and after the washing of the seawater, the remaining sand will remain in the water, and the repeated high tide and low tide process will make the sand gather on the beach to form a beach.

That's why there's so much sand on the beach.

The sedimentation of seawater is divided into littal, shallow, semi-abyssal and abyssal sea. Because the sediment of the ocean has better sortability, that is, the larger the particle size of the sediment carried by the river entering the sea, the earlier the sediment will be deposited and the closer it will be to the coast. Therefore, the sedimentation of the coastal zone is often sand, and the seaside that you see is the coastal sediment.

The deeper the sea, the smaller the particle size of the mechanical sediments, so the mechanical sediments in the semi-abyssal and deep seas are basically muddy.

Hello dear and happy to answer for you. The bottom brother of the seabed believes in the soil, kissing, and there is mud in the depths of the seabed, and their composition will be more complex, some are volcanic ashes, or biological debris and the like, and the mud on the land is still quite different. The Mariana Trench in the western Pacific Ocean is the deepest ocean floor we know of, with a water pressure of more than 1,000 atmospheres, in other words, 1.2 tons per square meter.

Although the pressure on the seabed is very high, the mud on the bottom of the Tandan seabed is soft, but the main component is soil, and I hope it can help you kiss.

The sea sand is a clam. It is as small as sand during the seedling stage, so it is called sea sand by local fishermen. As time grows, the sea sand grows, the shell becomes darker, and it grows to the size of melon seeds, and the body size does not change much.

Sea sand is used as feed for marine animals such as crabs and shrimp during the seedling stage.

Sea sand: Sea sand lives in the soft mud of the low tide area of the intertidal zone, living in groups, the depth of the living layer can reach 50 cm, April every year is the spawning period, because it competes with the clams for bait, living space and oxygen in the water, especially its group lives above the clams, which can lead to the suffocation and death of the clams. The living habits of the sea sand determine its capture method, the capture tool is to make a sleeve-shaped bag with a net, one end is sealed, the other end is left with a mouth, the bag is flat on the soft mud in the sea sand living area, and the soft mud is scraped into the bag with a board, and the water and soft mud flow out of the mesh cracks, and the sea sand remains in the bag.

Before the 80s of the last century, the sea sand was widely distributed, the yield was very high, the local farmers vomited the sea sand into fertilizer for planting the land and silver, after the rise of shrimp farming, the sea sand became the high-quality bait for shrimp.

The sea sand is a clam.

The clams are as small as sand when they are young, so they are called sea sand by local fishermen. As time grows, the sea sand grows, and the color of the shell becomes darker, growing to the size of melon seeds, but the size of the body is basically not too different.

Compared with mussels, clams, Ezo scallops, oysters and other shellfish, the protein content of sea sand is only lower than that of Ezo scallops, and its crude fat content is in the middle, the carbohydrate content is the lowest, and the inorganic element content is the highest. The amino acid group of sea sand was very comprehensive, the total amount of essential amino acids was higher than that of oysters, the alanine content was the first among shellfish, and the sum of EPA and DHA content was significantly higher than that of other shellfish.

1. Seawater flushing and erosion; 2. Rivers on land carry large amounts of sediment into the sea.

It is formed due to the erosion of rocks on land by seawater. The more water-soluble components of the rock, such as limestone, are lost with the seawater, and the sand is very hard quartz will be retained, and the large quartz will gradually break into small pieces over time due to the impact and weathering of the seawater, until it becomes small grains of sand.

After the weathering of the rock, it is carried by the transportation of wind or water current, the small mass is taken away and deposited to form the soil - plain, the medium mass is taken away when the wind speed or flow rate decreases and the sediment is deposited to form a beach (the soil is carried farther when the carrier speed drops lower, and the gravel is deposited in advance), and the large mass remains in place and continues to be weathered. In the end, it turned into soil, and that's how the soil on Earth is now formed. Of course, there are also phenomena of magma eruptions forming rocks, although there are far fewer volcanoes today than in ancient times.

The sand used now is brought from the sand field, where the sand gathers.

The main component of sand is silica.